Medium-duty cords usually are grounded extension cords, which include the third wire and plug prong for grounding. They have plugs that accept three-prong grounded appliance cords.
A 14-gauge cord is for medium duty applications (lawnmowers, power drills, table saws, etc.). A 10- to 12-gauge cord is for heavy and extra heavy duty applications (chainsaws, circular saws, shop vacs, air compressors, etc.).
150 Feet Extension Cord Amp Rating + Wattage Chart
| DEVICE AMPS: | EXTENSION CORD SIZE: | MAXIMUM WATTAGE (AT 110V): |
|---|---|---|
| Up To 7 Amps | 14 AWG (Light Duty Cord) | 770 Watts |
| 8 To 10 Amps | 12 AWG (Medium Duty Cord) | 1,110 Watts |
| 11 To 15 Amps | 10 AWG (Heavy Duty Cord) | 1,650 Watts |
| 19 To 20 Amps | 10 AWG (Extra Heavy Duty Cord) | 2,200 Watts |
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